Water-tube boiler.



ma. 669,773. Patented Mar. l2, lam. E. R. sTETnmus.

WATER TUBE- BUILE-R.

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Patented Mar. I2, I90I.

E. B. STETTINIUS.

WATER TUBE'BOILER.

`(Applirntou me@ Har. 5, 1900` 3 Sheetssheet 2.

(No Model.)

hib/5 Patented Mar. I2, |90I.

E. n. .sTETT|N.|us, WATER TuBE'BmLER.

(Application led Mar. 5, 1800.) (N uv Model.)

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N ITnD STATES PATENT OFFTCE.

EDWARD R. S'IET'IINIUS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STIRLING COMPANY, OF SAME PLACE.

WATER-TUBE BOILER.

SPECIFCATION forming' part 0f Letters Patent N0. 669,773, dated March 12, 1901.

Application filed March 5, 1900. Serial No. 7,356. (No model.)

To (1J/Z whom, t may concern,.-

Be it known that I, EDWARD R. STETTINTUS, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented a new and useful Improve ment in Water-Tube Boilers, of which the following is a specication. Y

The object ot' my invention is to improve the vertical water-tube boiler of the type commonly known as the Stirling boiler; and the invention consists in the features and combinations hereinafter described and claimed.

In the accompanying drawings, Figure lis a cross-section of one form of my improved boiler, the circulating pipe or pipes heilig shown in dotted lines; Fig. 2, a longitudinal sectional elevation showing the circulatingpipes outside the boilersetting; Fig. 3, a cross-section of another form of my improved boiler, the circulating pipe or pipes being also shown in dotted lines; Fig. 4, a longitudinal sectional elevation of the boiler, showing the circulating-pipes inside the walls or setting; and Eig. 5 the same as Fig. 4t, except that the circulating-pipes are embedded in the walls or setting.

A, A', and A2 are elevatedsteam and water drums, a pipes communicating between the steam-spaces thereof, and o. pipes communieating between the water-spaces thereof; B, lower mud-drums; C, banks of tubes connecting the elevated steam and water drums with -the lower mnd-drums; D, circulating-pipes connecting the ends ofthe rear or middle elevated steam and water drum with the ends of the front lower m ntl-drum; E, the fireplace, and e a flre-brick arch over the same, and E fire-brick partitions iny rear of and adjacent to the front and middle banks of tubes, respectively.

The Stirling type of boiler, to which my invention relates, is so well known that I do not consider it necessary to describe its construe 1 In this View, and y tion or operation in detail. because they are clearly shown inthe drawings, no description is considered necessary of the elevated steam and water drums and connectingpipes, lower mud-drums, banks of tubes connecting the lower m ud-drn ms with the elevated steam and water drums,fire-brick arches and partitions7 and other features in common use as parts thereof. In addition to these partsor features, however, I provide special circulating-pipes between the rear or middle elevated steam and water drum and the front lower m ud-drum, which circulatingpipes communicate with these drums at or near their ends, respectively, and are embedded in the walls or setting of the boiler or placed inside or outside thereof, as desired. In Figs. l and 3 the circulating-pipe is shown in dotted lines and is intended to be outside the walls or setting, as shown in Fig. 2. In Fig. 4c the circulating-pipes are shown as inside the walls or setting, and in Fig. 5 they are shown as embedded in the walls or setting. As already stated, these pipes communicate with the end portions of the drums to which they are attached, respectively; but theirconnectons are not necessarily at the extreme ends of the drums, connection near the ends being sufficient. As shown, feedwater is to be introduced into the rear mud-drum; but it may be introduced into the rear elevated steam and water drum or elsewhere, as desired.

In filling, the feed-water being introduced into the rear mud-drum passes up through the rear bank of tubes into the rear elevated steam and water drum, in the form of boiler shown in Fig. I, and up through the rear and middle banks of tubes into the rear and middle elevated steam and water drums in the form shown in Fig. 3, and from the rear or middle steam and water drum, as the case may be, it passes down through the circulating-pipes to the front mud=drum and thence up through the front bank of tubes to the front elevated steam and water drum, also from the rear or middle steam and water drum, through the connecting-pipes, to the front steam and water drum.. In operation, the front bank of tubes being in the hottest part ot' the boiler, the most rapid upward circulation will be through this bank; but the circulating-pipes permit a constant downiow and supply of water to take the place of water converted into steam in this bank of tubes, and also the place ot' water passing from the front steam and Water drum into the rear and middle steam and water drum or elsewhere. The water-spaces of the front and rear steam IOO used, as desired.

and water drums or front and middle waterdrums, as the case may be, communicating with each other, water passes from one of these drums to the other, as required by circulation and other conditions. In other words, the circulating and connecting pipes provide forapowerful circulation of Water up through the front bank of tubes and across from the front steam and Water drum to the rear or middle steam and water drum, as the case may be, and down to the front mud-drum, and so on in circuit, the practical effect being that the tubes of the front bank are more completely filled with cooler water or Water free from steam and the transmission of heat in this bank thereby greatly increased. In addition to this primary circulation there are also local circulations, as follows: a local circulation in the tubes of the rear bank in the form shown in Fig. l and, owing to the water connections between the rear and middle steam and water drums, a continuous circu lation down the rear bank, up the middle bank, and across from the middle steam and water drum to the rear steam and water drum in the form shown in Fig. 3. These local circulations serve to heat the feed-water, and thereby provide for separation and a settlement ofscale-forming matter in the rear and cooler parts of the boiler. If feed-water be introduced in the rear or middle steam and water drum or elsewhere in the rear part of the boiler, the circulation as such will be practically unchanged.

The circulating-pipes being ot larger diameter than the diameter of the tubes of the several banks and being located in a comparatively cool part of the boiler provide for a constant and abundant supply of water from the rear part of the boiler to the front part, and this without having serious counter-currents in the tubes furnishing` the heating-surface and primarily intended for the generation of steam.

Although I have shown and described one circulating-pipe at each end of the boiler, it will be understood that one or more may be It will also be understood that instead of two circulating-pipes, one at each end, a single circulating-pipe may be used at one end only.

I claim-- l. In a water-tube boiler, the combination of a plurality of elevated steam and water drums, pipes communicating between the steam-spaces and the water-spaces ot said drums, respectively, a front lower mud-drum, a rear lower mud-drum, a bank or banks of tubes connecting the rear mud-drum with the steam and water drum or drums in rear of the front steam and water drum, a bank of tubes connecting the front mud-drum with the front steam and water drum, a circulating pipe or pipes at or near the ends of and communicating between the front mud-drum and the steam and water drum in rear of the front steam and water drum located in cool relation to the boiler-setting and giving an auxiliary circulation at the end between the two drums, means fol-introducing feed-water, and means for drawing o steam, substantially as described.

2. In a water-tube boiler, the combination of a plurality of elevated steam and water drums, pipesV communicating between the steam and the water spaces of said drums, respectively, a front lower mud-drum, a rear lower mud-drum, a bank or banks of tubes connecting the rear mud-drum with the steam and water drum or drums in rear of the front steam and water drum, a bank of tubes connecting the front mud-drum with the front steam and water drum, a circulating-pipe at each end of and communicating between the front mud-drum and the steam and water drum in rear of the front steam and water drum located inside the boiler Walls or setting and giving an auxiliary circulation at each end between the two drums, means for introducing feed-water, and means for drawing oft steam, substantially as described.

EDWARD R. STET'FINIUS.

Witnesses:

PIERsoN W. BANNING, WALTER S. LUCAS. 

